1, respiratory diseases: tracheitis, asthma, lung disease, etc.

2. Cardiovascular and cerebrovascular diseases: arrhythmia, heart disease, hypertension, etc.

3, circulatory system diseases: diabetes, gastroenteritis, etc. ;

4. Motor system diseases: inflammation or injury of joints or muscles.

Extended data

800 meters, the start is on their own runway, and athletes can't leave their own runway until they pass the separation line that marks the swimming lane. In the first round of the group competition, which runway the athletes are arranged on is freely arranged by the computer. In the next few rounds, the choice of runway depends on the performance of athletes in the final round. The purpose of this rule is to make better athletes queue up on the middle runway. Good runways are Runways No.3, No.4, No.5 and No.6, which should be occupied by the top four athletes respectively. 1, 2, 7, 8, the road is occupied by the last 4 bits.

References:

Baidu encyclopedia -800-meter run